The sixth season of Project Runway – finally out of the courts and moving to Los Angeles when it premieres on Lifetime August 20 – will lose no time amping up the Hollywood glam factor. For one of the show’s biggest challenges, the designers will have to work their magic on powerhouse pop diva Christina Aguilera and designer Bob Mackie, the so-called Sultan of Sequins, and make a costume for Aguilera to wear in concert.

“The contestants were beside themselves when they heard who they were designing for,” Runway executive producer Jane Cha tells TVGuideMagazine.com. “They couldn’t believe it was Christina. And they really had to think about it, because costuming is not their forte.”

But it is the forte of the legendary Mackie, who is best known for outfitting Cher and Tina Turner. “We tap into his archives, so it was very interesting,” says Cha. “For the designers, it will be lots of glitz and glam for the stage, and that’s very different from American sportswear.”

Was Aguilera pleased with her new garments? “She was really happy with the results,” says Cha.

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